jmonkeyengine/jme3-niftygui/src/main/resources/Common/MatDefs/Nifty/NiftyTex.frag

uniform sampler2D m_Texture;
uniform vec4 m_Color; 

varying vec2 texCoord;

void main() {
    vec4 texVal = texture2D(m_Texture, texCoord);
    gl_FragColor = texVal * m_Color ;
}